Repair wise, he barely indicates that Canon has the edge over Nikon. They both have 5 lenses/bodies on the list, but Nikon does show up higher on it on average. The repair cost & time of Nikon service is somewhat higher.
He does use "Nikon fanboy" a lot - probably some personal experience there he is talking to. Reading between the lines I think he has a bit of a grudge against Nikon because they stopped selling repair parts to him and raised prices.
As far as I can tell Canon has somewhat better reliability and repair service, but it doesn't seem to be enough to get excited about. As usual Canon and Nikon are more or less neck and neck.
By the way I'm all Canon and will never buy a Nikon.
For running a rental business, repair service cost and turnaround time (6 days for Canon and 26 for Nikon) are significant factors because a lens out of service is lost income. Another point that he makes is that now everything needs to go back to Nikon. Their company does many of the smaller repairs on their own, which helps lower costs and time out of service. For a individual user, it matters less but can still be a factor. I'd hate to have a in issue with a lens, and then having it take a month's time to get it repaired.